The following day after perfoming oral on a lady I will feel like I have a stomach virus. This has happened the last three times that I have performed oral sex on a woman. It has happened with three different women so I do not believe it to be a health issue with any one of them. The next day I will develop an upset stomach, feel fatigued, and sometimes feverish. Anyone have any ideas? It lasts for a day or two and then it passes. Its really a bummer as I enjoy pleasing a woman orally but I am a little apprehensive now because I think that in the morning I will feel sick. As a side note, I do not drink alcohol so its not a hangover type of issue. Thanks for any responses.